Carburetor



Sept. 21 1926. 1,600,294

, M. NICE cmsuamon Filed March 13. 1923- 2 Sheets-Sheet 1 12 M; RNi'ce,

WITNESSES A TTORNE YTS Sept. 21 1926.

M. R. NICE I cansuamon Filed March 13. 1923 2 Sheets-Sheet 2 INVENTOR M.R Nice ATTORNEYS Patented Sept. 21, 1926.

UNITED STATES MELVIN R. NICE, OF FRANKFORD, PENNSYLVANIA. I

CABBURETOR.

Application filed March 13, 1923. Serial N 0.624246.

This invention relates to carburetors adapted for use in connection withinternal combustion engines and has for its object the provision of adevice which will supply an economical combustible mixture at all timesin accordance with the requirement of theengine.

Another object of the invention is the provision of a carburetor havinga primary and secondary air supply and a fuel supply controlled by thesame suction-operated mechanism. i

'A further object of the invention is the provision of a carburetorhaving a primary and secondary air supply and a manual control forvarying the secondary air supply.

A still further object of the invention is the provision of a carburetorhaving a primary and secondary air supply and fuel supply controlled bythe same suction-operated mechanism and a manual control for Otherobjects and advantages will become apparent during the course of thefollowing description. 7

The invention is illustrated by way of example in the accompanyingdrawings, in which Figure 1 is a vertical section of a carburetorconstructed in accordance with my invention.

Figure 2 is a view in perspective of the carburetor with the parts indetached relation. 7

Figure 3 is a bottom plan View of a conical baflle.

Figure 4 is a top plan view of the cup carrying the fuel valve.

Referring more particularly to the drawings, 1 designatesa body memberin the shape of a cup having a flange 2 at its upper peripheral edgeupon which is mounted an inverted cup-shaped member 3 having a flange 4:in contiguous relation with the flange 2. The cup-shaped member 3 isprovided with a central opening 5 in itsrtop from'the periphery of whichis extended a conduit 6 which is adapted to be connected to the manifoldof an internal combustion engine. 'A shaft? is mounted transversely ofthe conduit 6 to which is rigidly connected a throttle valve 8 forcontrolling the flow of mixture to the engine.

Projecting fromthe cup-shaped member 1 and centrallyfrom the bottomportion is a hollow internally threaded boss '9 into which is adapted tobe screwedv the upper end of a plug 10 having a fuel chamber 11. Thelower reduced end 12 of the plug is threaded and provided with a passage,13

adapted to be connected to afuel lead. 'A

A. screen 18 is held in place at the lower end of the conical chamberlS) formed in the bottom of the cup-shaped member l and separates saidchamber from the chamber 11, sa d screen being rigidly secured by meansof the plug 10. I

Located centrally of the cup-shaped member 1 and formed integrallytherewith, is a post 20 having a central passage 21 extending verticallyof the post. cutaway toforman annular groove 22 theree chamber 11 isconnected withthe chamber 7 The post is by providing a boss 23 abovesaid groove V which is provided with a plurality of vertical passages 24opening at their lower ends into the groove 22 and at their upper'endinto a conical seat 25 formed at the; upper end of the boss 23. V

Slidably mounted on the post 20 is a plung er 26 having upper andlowerperipheral flanges 27 and 28, respectively. The post 20 is received by abore 26? located centrally of the plunger 26. The peripheries of saidflanges are adapted to be slidably engaged with the inner wall of asliding sleeve 29 which has its outer cylindrical wallin engagement withthe inner cylindrical wall of the cup-shaped member 1. 'The spacebetween the plunger 26,its flanges 27 and 28, and the inner wall of thesleeve 29 forms an air chamber 30 which is supplied with air through a,plurality of perforations 31 formed in the wall of the cup-shapedmember 1. Arcuate-shaped slots 32 formed in the sleeve-29 are adapted toregister with the perforations 31 when the sleeve 29 is in its lowermostposition. A series of perforations 33 formed inthe wall of the plunger26 connect the annular groove 22"of 'the' post 20 with the air chamber30. V i

The portion of the body of the carburetor which is located within thecup-shaped member 3 and above the cup-shaped member 1 forms a mixingchamber 34. A cup-shaped member 35, located in the mixing chamber, isprovided with a plurality of perforations 36 in its bottom portion. Thebottom portion of the cup-shaped member is extended laterally to form anannular flange 37 which rests on the top of the plunger 26 while adepending flange 33 extends downwardly into'the hollow plunger andengages the inner wall of the same.

Projecting centrally from the base portion of the cup-shaped member 35is a fuel valve 39. Said valve projects downwardly into the fuel passage21 in the post 20.

I A conical baffle 40 is mounted in the conical seat 25 of the boss 23and has its conical surface provided with spiral grooves 41 as shownmore particularly in Figure 3. These grooves connect with the verticalpassages 24 and provide a communication between the annular groove 22and the cupshaped member 35. The cup-shaped member is provided with aplurality of perforations 43 in its side wall which places thecup-shaped member in communication with the mixing chamber 34 at a pointbelow the open end of the cup-shaped member. A coiled spring 44surrounds the cup-shaped member 35 having its lower end in engagementwith the annular flange 37 whereby the cup-shaped member is forced intoposi tion on the top of the plunger 26 and has an arm 45 extended to theslidable sleeve 29 and rigidly connected with an upstanding lug 46formed integrally with the sleeve 29. It will be noted that the springmaintains the cup-shaped member in its lowermost position and againstthe top of the plunger 26 when the sleeve 29 is in any position.

Adjacent the lug 46 and on the sleeve 29 is provided a bearing 47 intowhich extends thereduced end 48 of an operating arm 49. Said rod isprovided with an enlarged portion 50 which is slidable within aninclined slot 51 formed in the wall of the body member 1- so that as thearm is shifted the enlargement 50 will move upwardly or downwardly inthe slot and thereby raise or lower the sleeve 29, as the case may he.

The outer end of the arm 49 is provided with a collar 52 for connectingthe arm to an operating rod which is generally extended to the dash ofan automobile whereby the same may be continuously actuated by theoperator ofthe car on which the device is used. I

The operation of my device is as follows:

Fuel is fed by suction through the passage 13 and into chamber 11 whenthe engine is operating. Fuel then is filtered by means of the screen 18and passes through the conduit 21 in the post 20 and past the fuel valve39 through the spiral passages 41 in the baffle 40. The fuel is furtherbroken up and mixed with the air which is passed through the verticalconduits 24 in the boss 23. Air enters the passages or ports 31 in thebody member 1, filling the chamber 30. Air is then drawn through theradial passages in the plunger 26 and into the groove 22 in the post 20.The passages 24 are in communication with the annular groove 22. Suctionof the engine raises the cup-shaped member 35 against the tension of thespring 44 thereby raising the fuel valves 39. The combustible mixtureexpands in the cup-shaped member 35, with some of it passing through theradial perforations 43 and the rest passing through the open end of thecup-shaped member 35 and into the mixing chamber 34.

As the engine speeds up the plunger 26 is raised and the flange 27 isremoved from its peripheral engagement with the inner wall of the sleeve29 whereby secondary air from the chamber 30. passes up around theflange 27 into the mixing chamber 34 and mixes with the mixture from thecup 35 and thence )fiSSGS through the conduit 6 to the engine.

When it is desired to shut off the amount of secondary air from passingaround the flange 27 of the piston 26 and the air admitted to the airchamber 30, the arm 49 is actuated when said arm moves upwardly in theslot 51, raising the sleeve 29 above the periphery of the flange 27. Theraising of the sleeve 29' does two thingsfirst, it relieves pressure onspring 44 andthereby permits the cup-shaped member 35 to be raised to agreater extent and likewise the fuel valve 39 from the upper end of thefuel conduit 21; secondly, it moves the arcuate shaped slots 32 over theperforation '31 of le body member 1 thereby cutting off the supply ofair to the chamber 30 and likewise the supply of air to the verticalpassages 24. When the arm 49 is operated, as has been described, agreater flow of fuel will be had with a constant decrease in the flow ofair and therefore a richer mixture will be supplied to the engine. 7

It will be seen that the actuation of the arm 49 will materially aid insupplying a said sleeve for dividing the body member into an air chamberand a mixing chamber, said plunger being provided with a bore, and airpassages connecting the bore with the air chamber, a fuel conduitprojecting centrally within the hollow plunger, a metering pincontrolling the flow of fuel from the conduit, a resilient means connected with the sleeve for resisting movement of the metering pin, and afuel lead connected with the fuel conduit.

2. A carburetor comprising a hollow. body member provided with radiallydisosed air passages, a sleeve movable in the ody member and havingelongated slots registering with the air passages in the body member, asuction operated plunger movable in the sleeve and provided with a bore,and air passages connecting the bore with the air chamber, a'fuelconduit projecting centrally of the hollow plunger, a cupshaped memberprovided with a perforated bott0m, the metering pin depending therefromand projecting into the upper end of the fuel conduit, and resilientmeans connected with the sleeve and engaging the cup-shaped member formaintaining the metering pin in closed position with the upper end ofthe fuel conduit.

3. A carburetor comprising a hollow body member provided with radiallydisposed air assages, a sleeve movable in the body memer and havingelongated slots registering with the air passage in the body member, asuction operated plunger movable in the sleeve and provided with a bore,and air passages connecting the bore with the air chamber, a fuelconduit projecting centrally within the hollow plunger, a boss on theupper end of the fuel conduit slidably engaged by the hollow plunger andhaving conically disposed air passages, and a conical seat, acone-shaped baffle mounted in the seat for spraying air and fuelupwardly towards the mixing chamber, and a metering pin controlling theflow of fuel from,

the conduit.

4. A carburetor comprising'a hollow body member, a sleeve slidablymounted in the body member, a hollow suction-operated plunger movable inthe sleeve, a cup-shaped member mounted on the upper open end of thehollow plunger and provided with a perforated bottom and a metering pindepending therefrom and projecting into the open upper end of the fuelconduit, a boss on the upper end of the fuel conduit slidably engaged bythe plunger, having vertical air passages, and a conical seat, aconeshaped baflle mounted in the seat for spraying the air and fuelupwardly towards the perforated bottom of the cup-shaped member. j

5. A carburetor comprising a hollow body member, a sleeve movable in thebody member, a hollow suction-operated plunger movable in the sleeve, afuel conduit projecting centrally within the hollow plunger, a cupshaped member provided with a perforated bottom, and a metering pindepending therefrom and projecting intothe'upper end of the fuelconduit, a resilient means'engaging the cup-shaped member formaintaining the metering pin in closed position with the upper end ofthe metering pin in closed position with the upper end of the fuelconduit, and manual means for reciproeating the sleeve for varying thesupply of air to the air chamber and for releasing tension of the springon the cup-shaped member, spiral grooves on the conical surface of thebaffle in communication with the to communicate with the fuelconduitwhen the metering pin is raised.

6. A carburetor comprising a hollow body member provided with radiallydisposed air passages, a sleeve movable in the body member, a hollowsuction-operated plunger movable in the sleeve and provided with aflange in engagement with said sleeve for dividing the body member intoan air chamber and a mixing chamber, and adapted to control the supplyof secondary air to the mixing chamber, a fuel conduit projectingcentrally within the hollow plunger, a cup-shaped member provided with aperforated bottom, and a metering pin. depending therefrom andprojecting intothe'upper end of the fuel conduit, a spring connected atone end with the sleeve, with its other end engaging the cup formaintaining the cup against the upper end of the hollow plunger, and themetering pin in closing position with the upper end of the fuel conduit.

MELVIN R. NICE.

